The other high schools are Boise (1902) in the east, Borah (1958) in the southwest, and Timberline (1998) in the southeast.

The Capital High boundary includes sections of Eagle and Garden City.

[5][6] Capital competes in athletics in IHSAA Class 5A in the Southern Idaho Conference (5A) (SIC).

The tennis team has won 16 state titles, including five consecutive from 1972 to 1976.

[7] The boys basketball team won four consecutive A-1 (now 5A) state titles from 1975 to 1978.